Surface Wave(:
Side, Side, Side. Its usually used in trigonometry when you have to find two shapes that are similar or congruent.
8 Sides on a Stop Sign
The prefix SS in an acronym for Sailing Ship. Other examples are: USS - United States Ship USCGC - United States Coast Guard Cutter HMS - His/Her Majesty's Ship (HMAS - Australia, HMCS -...
Many people associate SOS with 'save our ship'.