Braille pattern dots-1

The Braille pattern dots-1 ( ) is a 6-dot or 8-dot braille cell with the top left dot raised. It is represented by the Unicode code point U+2801, and in Braille ASCII with "A".
Unified Braille.
In unified international braille, the braille pattern dots-1 is used to represent open, unrounded vowel sound, like /æ/ or /ɑ/, such as the Latin letter A, Greek alpha, Cyrillic А, Hebrew/Arabic aleph, etc. It is also used to signify the number 1.
Plus dots 7 and 8.
Related to Braille pattern dots-1 are Braille patterns 17, 18, and 178, which are used in 8-dot braille systems, such as Gardner-Salinas and Luxembourgish Braille.
related 8-dot kantenji patterns.
In the Japanese kantenji braille, the standard 8-dot Braille patterns 2, 12, 24, and 124 are the 8-dot braille patterns related to Braille pattern dots-1, since the two additional dots of kantenji patterns 01, 17, and 017 are placed above the base 6-dot cell, instead of below, as in standard 8-dot braille.
Kantenji using braille patterns 2, 12, 24, or 124.
This listing includes kantenji using Braille pattern dots-1 for all 6349 kanji found in JIS C 6226-1978.
Compounds of 一.
 - 数 + #1 = 一
Compounds of 亜.
 - あ + selector 1 = 亜