且 means “moreover, and also”

かつ · katsu

Also: also, furthermore

Kun'yomi (Japanese reading)
かつ
On'yomi (Chinese reading)
ショ, ソ, ショウ

JLPT N1 · Taught in secondary school · 5 strokes

The story

Picture a little stand with shelves stacked one above another: one thing on top of the next. 且つ means "and also", as in 必要かつ十分, necessary and sufficient; today it is mostly written in kana, and 尚且つ, also often in kana, is "and what's more".

Used in 且つ (katsu, and also/moreover) and 尚且つ (naokatsu, and furthermore)

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Readings from KANJIDIC2, © EDRDG, CC BY-SA.