Feather
Six digits that can't even sum to double digits.
A number of 100,000 or more whose digits sum to 9 or less. Like 100000 (sum 1) or 100008 (sum 9) — big frame, feather weight.
Your record
There are 3,004 feather numbers in range, 0.30%, about 1 in 333 — rarer than heavy (0.50%). A six-digit frame with a single-digit sum means the body is almost all zeros, propped up by a few small digits.
Its structure dictates its look: the leading digit must be 1–9 (otherwise it wouldn't be six digits) and the remaining five are nearly all zeros. Typical members like 100008, 200001, 300000 — a head, a tail, and a desert in between. 1,000,000 sneaks in with digit sum 1 as the list's only seven-digit member.
Feather and heavy are a symmetric design at the two tails of the bell curve — but the no-leading-zero rule costs feather some two thousand seats. Two traits that should mirror each other, teaching you via exact counts the difference between "roughly symmetric" and "exactly symmetric".