tombstone, monument
碑 centers on a stone marker that commemorates or records: a tombstone or a monument. Both meanings share the idea of a lasting stone inscription.
碑 combines 石 (stone) with 卑, which likely contributes the sound and relates to low or flat, suggesting a flat stone slab used for inscriptions.
A stone (石) marker that is low and flat (卑) like a tombstone or monument, standing to record a memory.
For ヒ, imagine a stone monument that makes a soft 'hee' sound when the wind blows past it: hee -> ヒ, and the stone remembers the past.
stone monument bearing an inscription (esp. memorial for future generations); stele; stela
stone monument
inscription; epitaph; epigraph
gravestone; tombstone
monument (stele, gravestone, etc.) engraved with a waka
epitaph; inscription on a tombstone
oral tradition; legend; folklore
slab with a haiku cut on it
erection of a monument
monument to the faithful who died in battle
cenotaph; memorial monument
war memorial
broken stone monument
epigraphy
stone monument
inscription; epitaph
back of a stone monument
war-memorial monument
commemorative plaque (usu. on a stone); stone monument (bearing an inscription)
monumental