What does it mean to encounter the @ symbol when using the nuxt-koa template?

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css: [

"element-ui/lib/theme-chalk/reset.css",
"element-ui/lib/theme-chalk/index.css",
"@/assets/css/main.css"

],
/ *
* * Plugins to load before mounting the App
* /
plugins: [

"@/plugins/element-ui"

],

what does it mean to encounter the @ symbol when using the nuxt-koa template? Is this the directory where @ represents src files in vue-loader? If so, I did not find the relevant configuration file of @ through the global search, and there is no src file directory in the project. I also hope the passing boss can help explain it. Thank you

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Apr.06,2022
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-64f5-1b49fd1-34d88.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b49fd1-34d88.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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