How does the vscode snippet output the $symbol?

vscode how does the code snippet output the $symbol?
entering the $ symbol normally or entering \ $ will eventually be omitted.

Code-snippet visual-studio-code
Feb.11,2022

try $$?

enter\ $

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MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1e49404-437f7.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e49404-437f7.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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