The glassmaker's mark (rarely glassmaker's cross: 
) is a symbol of glassmakers. It is a figure eight (infinity sign) over a sword or cross, illustrating a German glassmaker's saying: Es ist ein unendlich Kreuz, Glas zu machen ("it is an endless cross to make glass").
The symbol dates to 1948, when the magazine Glastechnischen Berichte displayed it on the cover. The figure eight was said to symbolize the material glass in its two phases, as a molten liquid on the left and as a non-crystalline solid on the right. In the transition between the two states, a metal sword, which stood for the glassmaker's pipe, was a sign of man's dominion over nature.
The German Technical Glass Society (Deutsche Glastechnische Gesellschaft)[1] and the Czech Glass Society (Česká sklářská společnost)[2] use the glassmaker's mark as the symbol of their associations.
Sources
[edit]- Friedrich Holl: Symbol für Glas, In: Friedrich Holl (Hrsg.): Die Poesie des Glases. Des Glases Lob – Der Arbeit Lied – Des Glases Geist, 3. Aufl., Zwiesel, 1983; 1. Aufl. 1966 auch: Werks-Kurznachrichten der Grazer Glasfabrik (Untertitel: „Der Motzer“), Nr. 60, Graz 1963, S. 1–56
- Julius Broul: Das Symbol für Glas, In: Glass Science and Technology, Verlag der Deutschen glastechnischen Gesellschaft, Frankfurt am Main, 1999, Jg. 72, Heft 4, S. N39-N40, ISSN 0946-7475
- Marita Haller: „Das unendliche Kreuz der Glasmacher“ unterstützt die Glasaktivitäten der Region, Pressglas Korrespondenz, 2010/3, S. 316
Well, that’s interesting to know that Psilotum nudum are known as whisk ferns. Psilotum nudum is the commoner species of the two. While the P. flaccidum is a rare species and is found in the tropical islands. Both the species are usually epiphytic in habit and grow upon tree ferns. These species may also be terrestrial and grow in humus or in the crevices of the rocks.
View the detailed Guide of Psilotum nudum: Detailed Study Of Psilotum Nudum (Whisk Fern), Classification, Anatomy, Reproduction