to bring someone to attention in consideration for a particular role, position, or opportunity

to formally cite or acknowledge someone for a commendable action or accomplishment

to include or reference another user's username or handle in a post, comment, or message, often by using the "@" symbol followed by their username, drawing their attention to the content or inviting them to join the conversation

a short note recognizing a source of information or of a quoted passage

an official recognition of merit