Spring-loaded camming device by Metolius with 3 moving cams. See SLCD.

SLCD with 3 moving cams, rather than four.

Towering Cumulus clouds. If they keep growing they become Cumulonimbus ( CB).

An abbreviation sometimes used to denote a towering cumulus cloud (cumulus congestus). Manually appended when appropriate to the lowest cloud layer in a METAR report for ASOS.

Transmission Control Unit

Third Country Unit

Acronym for Timing Control Unit.

Telephone Certificate Iowa Code § 476.29 gives the Board the authority to establish non-exclusive service territories for telephone utilities and grant certificates of public convenience and necessity. A TCU is established to enable the Board to evaluate requests to initiate or modify authority to provide local exchange telephone service. The Board examines each application to see if the company possesses the technical, financial, and managerial ability to provide the service it proposes to render and that the service is consistent with public interest. If this finding is made, the Board approves the application pending the filing and approval of maps and tariffs. A certificate of public convenience and necessity is then issued after the maps and tariffs are approved.

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