Variants and attestation
See Script and Prosdocimi 1988: 332 ff. on the identification of St. Andrew's cross with Theta. The small variant is reminiscent of the Etruscan/Venetic protoform attested on Venetic *Es 120, but the low dating of the two objects bearing this variant makes an immediate correlation unlikely.
A considerable number of St. Andrew's crosses in the Raetic corpus come from non-script or para-script contexts, which must be considered when working with the statistics of character occurrence. See Non-script notational systems.