頻出の記号/記法など

`!`

“Never return an abrupt completion” Shorthands

`?`

ReturnIfAbrupt Shorthands

`[[Name]]`

Internal Methods or Internal Slots

or Object’s property-attributes

…or Record’s field names

`@@name`

Well-known symbols

`%name%`

Intrinsic objects

`« »`

Lists

ギュメ (guillemet)

`{ [[Name1]]: value1, [[Name2]]: value2 }`

Record values

sans-serif typeface

Enums

bold

ECMAScript language values