労 means labor and is a JLPT N3 kanji. It has 7 strokes and uses the strength radical (力).
Stroke order · 7 strokes
On'yomi (音読み)
ロウ
Kun'yomi (訓読み)
ろう(する)、いたわ(る)、いた(ずき)
Radical
力 · strength
Strokes
7
How to remember 労
Under a shower of sparks (⺌), beneath a cover, strength (力) is at work — a picture of a factory. The real reason people say 'otsukaresama' is this kanji 労 — recognition of hard labor.