我到网上找到一个显示姓名的程序，其中“尹”字在代码段中的定义是如下程序：
data segment
car db 238 ;尹彩琴字符图形表
DB 2ah,238,0,0
DB 2ah,238,0,1
DB 2ah,238,0,1
DB 2ah,238,0,1
DB 2ah,238,0,1
DB 2ah,238,0,1
DB 2ah,238,0,1
DB 2ah,238,0,1
DB 2ah,238,0,1
DB 2ah,238,0,1
DB 2ah,238,0,1;10个
 
DB 2ah,238,1,0
DB 2ah,238,1,0
DB 2ah,238,1,0
DB 2ah,238,1,0
DB 2ah,238,1,0
DB 2ah,238,1,0
DB 2ah,238,1,0
DB 2ah,238,1,0
 
DB 2ah,238,1,0;9个
 
DB 2ah,238,-5,-11
 
DB 2ah,238,0,0
DB 2ah,238,0,1
DB 2ah,238,0,1
DB 2ah,238,0,1
DB 2ah,238,0,1
DB 2ah,238,0,1
DB 2ah,238,0,1
DB 2ah,238,0,1
DB 2ah,238,0,1
DB 2ah,238,0,1
DB 2ah,238,0,1
DB 2ah,238,0,1
DB 2ah,238,0,1
DB 2ah,238,0,1
DB 2ah,238,0,1
DB 2ah,238,0,1
DB 2ah,238,0,1;16个
 
 
DB 2ah,238,5,-15
 
DB 2ah,238,0,0
DB 2ah,238,0,1
DB 2ah,238,0,1
DB 2ah,238,0,1
DB 2ah,238,0,1
DB 2ah,238,0,1
DB 2ah,238,0,1
DB 2ah,238,0,1
DB 2ah,238,0,1
DB 2ah,238,0,1
DB 2ah,238,0,1;9个
 
DB 2ah,238,-8,-5
 
DB 2ah,238,1,0
DB 2ah,238,1,0
DB 2ah,238,1,0
DB 2ah,238,1,0
DB 2ah,238,1,0
DB 2ah,238,1,0
DB 2ah,238,1,0
DB 2ah,238,1,0;8个
 
DB 2ah,238,1,0
DB 2ah,238,1,-1
DB 2ah,238,1,-1
DB 2ah,238,1,-1
DB 2ah,238,1,-1
DB 2ah,238,1,-1
DB 2ah,238,1,-1
DB 2ah,238,1,-1;;;;;;到此为止，“尹”字画完
这是怎么定义的？我不明白其中的1啊，-1啊是怎么回事？如果是坐标的话，我想知道它定义的原理？
哪位能帮我解答？