Hi @Zeke8990 , Welcome to the forums!
Good eye for a first time poster!
They represent the default breakpoints in Webflow.
tiny: mobile portrait
small: mobile landscape
medium : tablet
large: main
They are initialized in the Webflow main JavaScript file.
"site": {
"mediaQueries": [{
"key": "main",
"min": 992,
"max": 10000
}, {
"key": "medium",
"min": 768,
"max": 991
}, {
"key": "small",
"min": 480,
"max": 767
}, {
"key": "tiny",
"min": 0,
"max": 479
}]
}