HH

1. His or Her Highness
2. His Holiness

HH or 2H

Very hard (on lead pencils)

• strategist
• strategists
• strategy
• strath
• straths
• strathspey
• strathspeys
• strati
• straticulate
• stratification
• stratificational
• stratificational grammar
• stratifications
• stratified
• stratifies
• stratiform
• stratify
• stratifying
• stratigrapher
• stratigraphers
• stratigraphic
• stratigraphical
• stratigraphically
• stratigraphies
• stratigraphist