🧱>▪️

#subcategory #part of whole #smaller piece #sub-level #section part

🏠🧱⬇️

#house base #structural support #ground level #building bottom #sub-level

⬇️─

#below level #under baseline #sub-level #below standard

↳•📄

#indentation #sub point #document format #nested level #outline structure #sub-level