podium, stage, rostrum, terrace
壇 centers on a raised platform for public speaking or ceremony: a podium, stage, rostrum, or terrace.
壇 combines 土 (earth) with 亶, which likely contributes the sound. The earth radical suggests a raised earthen platform.
The left side 土 is earth, and the right side 亶 looks like a structure with a top and base. Picture a raised earthen platform built for a speaker to stand on.
For ダン, imagine a speaker standing on the podium and giving a speech that begins with a dramatic 'Dan!' sound: Dan -> ダン.
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taking the podium; mounting the rostrum; going on stage to give a speech, etc.
platform; podium; rostrum; pulpit
altar
Buddhist (household) altar
flower bed
on a stage; on a platform; on an altar
last moment; eleventh hour
(teacher's) platform; podium; dais
tiered doll stand (for hina dolls)
rostrum; the world of criticism
field in which one acts unchallenged; unrivaled sphere of activity; one's monopoly
ordination platform
literary world; literary circles
rostrum; platform
artists' world; painting circles
platform on which a structure is built; stylobate; foundation
the world of the haiku
Platform Sutra of the Sixth Patriarch; Platform Sutra
the stage; the theatrical world
dirt mound