image symbol set(ISS)

In System/38 graphics,a graphics symbol set in which each character is treated as a small image and is described by a rectangular array of picture elements.; IBM System/38制圖系統中的一種圖形符號集,其中的每一個字符都作為一個小圖象來 處理,并且由圖象元素的一個矩形陣列來描述。