From yard sales to the attics of our parent's homes, we have all probably come across weird objects that don’t seem to have any discernible purpose. Like anthropologists studying the site of an ancient city, we had to try and piece together contextual clues. But these days, through the magic of the internet, we can simply ask hundreds of thousands of people to help.
The “What is it?” online community is dedicated to helping people understand what obscure object they are looking at. So get comfortable, make your best guesses in the comments, and be sure to upvote your favorite posts.
#1 I Found This Many Many Many Years Ago…
Answer: Antique circa 1920 sterling silver lady's coin purse with a mirror

Image credits: navesurazal
#2 Been Trying To Figure Out The Purpose Of This Thing Ever Since My Buddy Moved Into His New House
Answer: It's a jig for bending metal wire and thin metal bars

Image credits: Sulpfiction
#3 What Is This? Uncle Had This Since Decades And Never Found Out What It This?
Answer: It must be the mineral Marcasite

Image credits: Secret_Ad_7878
#4 Saw This While Disc Golfing. What Is It?
Answer: It’s a slimemould

Image credits: LeeAmazon
#5 Found Outside A Restaurant Approximately 25 Years Ago. The Pieces Don't Move
Answer: Eyelet for a fishing pole

Image credits: flatearthnunchuck
#6 What Is This Symbol On A Passing Car's Rear Window? Seen In Georgia, Near Atlanta
Answer: Aegishjalmur, it’s an Icelandic magical stave. Used to protect warriors and instill fear in enemies

Image credits: EquivalentAnt2088
#7 Help! What Is This?
Answer: that is the pin that holds nail clippers together

Image credits: kairi8991
#8 A Friend Found This At A Lake In Glacier National Park, Any Ideas What It Is?
Answer: Looks like an ancient mastadon tooth

Image credits: Puzzleheaded-Sea-616
#9 Saw This From Our Plane
Answer: Utah’s Potash ponds are used in the separation of potassium from various mined and manufactured salts. The resulting potassium is used for fertilizer, animal feed and water softening

Image credits: AnglophileHistoryNut
#10 Why Is The Retaining Wall Like This?
Answer: Those are tieback anchors with their pointy end covered. They go long past the back of the wall and likely into some rock somewhere behind the retaining wall. They are there as reinforcement to prevent movement of the wall over time

Image credits: Minimum_Zucchini1572
#11 Found In My Yard In Central Massachusetts. Metal, Pretty Heavy
Answer: horse drawn carriage leaf sprngs

Image credits: vewyembawassin
#12 Found On Beach After Storm In Outer Banks, North Carolina
Answer: Jaw bone of a whale (blue whale, grey whale..?)

Image credits: neleh1989
#13 What The Heck Is This? Heavy, Made Of Glass, Found In A Freight Train Dump Yard
Answer: it's from a modern LCD projector. white light goes in, gets split into three, each color goes through a different LCD, then directed into this which recombines them into a coherent single "beam" which is what gets thrown into the screen

Image credits: Additional_Camel_837
#14 My Neighbor Has This In His Lawn, High Frequency Sound Comes Out Of It When I Pass It
Answer: It's an animal repellent

Image credits: prettylovers
#15 Found In Parents Bathroom Closet
Answer: I believe is a contact lens cleaner

Image credits: Bwhit1019
#16 What Is The Purpose Of These Flaps On The Back Of A Semi?
Answer: It's called a 'trailer tail'. The angle of the panels is supposed to ease the flow of air behind the trailer reducing aerodynamic drag and turbulence and increasing fuel mileage

Image credits: Mother_Bumblebee4949
#17 Found At A Thrift Store Nobody Knows What It Is
Answer: It's a toothpaste tube roller for convenience/efficiency

Image credits: Sad-Cartoonist-7959
#18 Over Orlando Florida
Answer: Spacex falcon 9 booster re-entering the atmosphere

Image credits: TheBrine05
#19 Found This At A Garage Sale…
Answer: For opening a soft boiled egg

Image credits: ThatguyGaming42
#20 Hanging On The Wall At My Parents House
Answer: Definitely egg cups and egg timer

Image credits: Intelligent_Tub
#21 Is This A Bullet Hole?
Answer: Looks like a high-speed impact punched through, so yeah it might be a bullet. If you can fit your INDEX finger in the hole, you are talking about a large caliber bullet. Look around in the trunk and see if you can find it or fragments of it

Image credits: colinfox0
#22 What Is This At My New Desk
Answer: That is a panic button

Image credits: sleepyandsad
#23 My Mom Found This By Her Pool Gate
Answer: It’s a holder for a cigarette. Theres usually a ring at the bottom. I own one. The flower opens and the beads slide up to keep the cigarette in place

Image credits: bacontacos420
#24 This Was Put Up In The Laundry Room
Answer: It’s a trail camera. Takes pictures when it detects motion

Image credits: Zerriphan
#25 Saw This At A Yard Sale Yesterday. Daughter Wanted It For Some Reason. We Don’t Have A Clue What It Could Be
Answer: Looks like a saloon door spice rack

Image credits: meangreene_
#26 What Are These Dots On My 2018 Atoyot For?
Answer: This is a marking by the manufacturer to indicate internal information about the window

Image credits: roro999999999
#27 What Is This Out On Lake Michigan?
Answer: It is called a "crib". They collect water and then water flows via gravity below the lake to the city's water filtration plants

Image credits: marglebubble
#28 I Inhereted This Decades Ago. What Is It?
Answer: Coal scuttle/portable heater

Image credits: space_jumper
#29 My Home Was Built In 1986. This Is On The Side Of The Upper Kitchen Cabinet. The Lid Comes Off. What Is It?
Answer: a paper cup holder

Image credits: Mission-College-7784
#30 Seen In A Boathouse In The Pacific Northwest
Answer: makeshift urinal

Image credits: B-Cerre-us
#31 Found At A Garage Sale. No One Knows What It Is
Answer: Indian brass bud vase

Image credits: MistakePitiful7105
#32 Found This In The Road Near My Car? Any Clue?
Answer: Bottle capper

Image credits: Outrageous_Ad6384
#33 Found On Hotel Room Floor, What The Heck Is It?
Answer: Looks like a blackhead removal tool

Image credits: jayboy120
#34 Dog Found This In My Backyard. I'm In A Largely Residential Neighborhood. Its Hard Plastic Not Soft Like A Shotgun Shell. Bottom Only Has That Small Piece Of Metal Not The Whole End. About 2.5inch Long
Answer: Looks like percussion cap for a hole puncher tool

Image credits: waf_67
#35 What Is This Thing In My New Apartment? Staff Have No Idea Either
Answer: Kinda looks like a doorbell chime

Image credits: k9bound
#36 Does Anyone Know What The Heck These Things Are Attached To These Dead Trees?
Answer: It's a moisture indicator. I'm assuming, some mix of goodies that gets darker as it dries out

Image credits: Aliveguy2021
#37 Got Really Drunk At A Fancy Club And Found This In My Purse Today, What Is It?
Answer: Toilet paper holder

Image credits: Sensitive_Volume_592
#38 What Is The Purpose For This Bottle Opener To Have A Pointy End And A Flat End?
Answer: The pointy end is to pierce a hole in a 1/2 gallon can of juice (need two holes, one at 12 o’clock and one at 6 o’clock to allow juice to flow out and air to flow in) while the flat end is to open a bottle cap

Image credits: intrepid604
#39 Any Idea What This Is?
Answer: it's a dreidel. A 4-sided toy marked with Hebrew letters and spun like a top in a game of chance

Image credits: Automatic-Happy
#40 These Wires Are In Every Room Of The Place I’m Moving To, What Are They For?
Answer: coax cable

Image credits: HovaPrime