Halp! For the life of me I cant add a red triangle (pointing up) to a sign. I’ve done it before so I know it works, but can’t do it today. Most lists show it as:
:U+1F53A:
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:1f53a:
:small _red_triangle:
:up _red_triangle:
No spaces in the worded ones
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Thank you Jesus…uh…Dwarftree 
I tried to use Boundless Information Station but the API was down.
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No problem 
I copied them all into a spreadsheet (Apple Numbers, sorry everyone) as backup and so I can add notes to emojis like color, size, if they look particularly good on certain signs, etc. I’d be willing to copy that to a more widely used online sheet, or even just post screenshots of the lists to some kind of blog.
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I use this website.
When you select the emoji you click the technical info button and it tells you the code.
You don’t use the U+ part of the codes.
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I would suggest not using screenshots so lazy people like me, lol, can copy and poaste ;)))
I usually use this google doc someone made. It lists all the keywords you can use as well as the actual name of the emojis. Boundless - Emoji - Google Sheets
I tried several sites though now I think it was user error since i was using the U+. I never said I was smart, just that I like purple. 
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Yeah, for html, the 1f53a is hexadecimal, so it needs an x: 
works for a red triangle
In html, it also takes the decimal version:
boundless
Which is 128314 for the red triangle, surrounded by & # and ending in ; for html =)