html - What does the "#" mean or stand for in a code? -


i'm trying figure out coding newbie. wondering # symbol means or stands in code, #55555 number. or #menu1 in div: div#menu1 ul.rmenu?

trying education

i think in case of #55555 , # indicates hexadecimal code , in case of #menu1 , # indicates menu1 id attribute..


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