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Lengwil commune (Thurgau canton, Switzerland)

image by Pascal Gross

I felt like running away when I saw this, or at least pretending that I hadn't seen, but duty is duty and I had better give it a go – but where and how do I start? Is it "tierced" yes, it is after a fashion, but it is also per pale in part and how on earth to describe that bottom section? Oh well, for better or worse here goes:
Issuant from a base Argent a triangle embowed of the Same whilst issuant for the apex of that triangle four beams radiant embowed Gules then per pale Gules four lozenges of the First conjoined then also of the First a swan statant Sable membered and beaked
of the Second.
Christopher Southworth

The emblem of Lengwil consists of the emblems of the former local communities of Oberhofen and Illighausen (see below). The tails symbolize the merger of the former local communities to form the Lengwil community (This is perhaps one of very few flag designs symbolizing the act of merging itself).

On 1 January 1998 the new commune of Lengwil was formed through the merger of Illighausen and Oberhofen bei Kreuzlingen (see below).

Illighausen
Oberhofen bei Kreuzlingen

See also:

Kreuzlingen district
Thurgau canton
Switzerland
Das neue Wappen der politischen Gemeinde Lengwil (by Hans Rüegg, 2002, German)

Illighausen (until 31 December 1997)

image by Pascal Gross

Argent a swan statant Sable beaked and membered Gules.
Christopher Southworth

Adoption of the coat of arms of the extinct Illighauser family from Constance. The colours correspond to those of the city of Constance.

Oberhofen bei Kreuzlingen (until 31 December 1997)

image by Pascal Gross

Gules three lozenges conjoined and throughout Argent.
Christopher Southworth

The lozenges go on the coat of arms of the Lords of Königsegg, the colours to the diocese of Constance. The number of three lozenges refers to the three villages Oberhofen, Lengwil and Dettighofen (which merged with Pfyn).