説明書

The only one. 唯一 is unique; 唯我独尊 is standing alone above all.

The hiragana え was made from 衣. Clothing in the old, plain sense. The shape is a robe with sleeves.

The orchid. One of the four plants of classical painting, standing for quiet nobility.

甲斐 is worth — whether a thing was worth the doing. 生き甲斐 is what makes a life worth living.