兜 - helmet, head piece

helmet (of a warrior); headpiece

aconite (esp. species Aconitum japonicum); wolfsbane; monkshood

Tusita heaven (one of the six heavens of the desire realm); Tushita

do not let your guard down after a victory; tighten the strings of your helmet after winning

large-headed midnight fish (Poromitra crassiceps)

Hercules beetle (Dynastes hercules)

tadpole shrimp (Triopsidae spp.); shield shrimp

tokin; small black headgear worn by yamabushi

Kabutochō (neighbourhood of Nihonbashi, Tokyo, where the Tokyo Stock Exchange is located)

inside of a helmet; hidden circumstances

helmet-shaped hood

spiked helmet