🎲❓{...}

#random selection #unknown elements #set notation #probability set #chance collection

[🔢...🔢]

#mathematical interval #number range #set notation #math range #data range #boundaries

{}🔣

#curly braces #brackets #code symbol #punctuation symbol #set notation

{1️⃣2️⃣3️⃣...}

#set notation #number set #positive integers #math set #sequence notation #infinite set #math