Play word 蛍雪 蛍雪 けいせつ diligence in studying (e.g. continuing to study even in such poor light as offered by a firefly or that reflected by snow)
Play word 行平鍋 行平鍋 ゆきひらなべ aluminum saucepan with a handle (usu. wooden) and often with snowflake-style embossed pattern (aluminium)