frame, framework, spindle, spool, bounding-box, (kokuji)
JLPT1 G7 S8 F922
Unlike the use of 卆 in 卒 and in derivative characters based on 卒 that were devised in China, in the Japanese-devised 枠 it is intended to represent a spinning machine. 枠 adds 木 tree/wood → *frame* of a spinning machine → *limit*; *range*.
[Full Kanji Etymology List]