Shorthand?

Not to nit pick but SPS stands for Soft Polyped Stoney. (like Acropora)
LPS stands for Large Polyped Stoney. (like Frogspawn)
A Herbie is a type of overflow (drain).
 
To give a bit more detail, SPS and LPS are hobby terms rather than scientific designations. SPS generally have a large number of very small polyps that closely hug the skeleton whereas LPS have large polyps that frequently extend a significant distance from the skeleton. Things like torch corals and brains are considered LPS whereas Acroporas are considered SPS.

A Herbie overflow is designed to be very quiet but, IMO, requires someone to be pretty adept with plumbing for the initial setup. There are several DIY threads about building a herbie.
 
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