Ordering points to identify the clustering structure (OPTICS) is an algorithm for finding density-based clusters in spatial data. It was presented by Mihael Ankerst, Markus M. Breunig, Hans-Peter Kriegel and Jörg Sander. Its basic idea is similar to DBSCAN, but it addresses one of DBSCAN's major weaknesses: the problem of detecting meaningful clusters in data of varying density. In order to do so, the points of the database are (linearly) ordered such that points which are spatially closest become neighbors in the ordering. Additionally, a special distance is stored for each point that represents the density that needs to be accepted for a cluster in order to have both points belong to the same cluster. This is represented as a dendrogram.

OpTic Gaming, LLC., also referred to as the The Green Wall, is a professional American eSports team and competitive gaming company. OpTic currently has teams playing Call of Duty, Halo, and . It was founded in 2006 by Ryan "OpTic J" Musselman and "OpTic KR3W". The company is owned by Hector "H3CZ" Rodriguez and co-owned by Matt "NaDeSHoT" Haag. The team is coached by Will "BigTymeR" Johnson. OpTic Gaming is the most known Call of Duty eSports team currently ahead of 2nd place FaZe Black. OpTic Gaming are two time X Games champions, winning in 2014 and 2015 respectively. On 3 December 2015, OpTic Gaming won the Best ESports Team of the Year at The Game Awards 2015.

An optic (not to be confused with optics, the science of light) is something that changes the behavior or properties of light.

Optics is the branch of physics which involves the behaviour and properties of light, including its interactions with matter and the construction of instruments that use or detect it. Optics usually describes the behaviour of visible, ultraviolet, and infrared light. Because light is an electromagnetic wave, other forms of electromagnetic radiation such as X-rays, microwaves, and radio waves exhibit similar properties.