Just thinking about the odd shapes that SP-D dodecamers (and all other trimers, hexamers, multimers etc) and the flexibility of the three molecules entwined built from collagen like sequences — that provides that long twined stretchy capacity of the SP-D arms, allowing the CRDs to “reach” for the spike proteins “peplomers” heterologous groups of proteins … I did not find the origin of that word but presume it is from peptide and the suffix “mer” or “mere” meaning group.