initialism = an abbreviation pronounced wholly or partly using the names of its constituent letters, e.g., CD = compact disc, pronounced cee dee
pseudo-blend = an abbreviation whose extra or omitted letters mean that it cannot stand as a true acronym, initialism, or portmanteau (a word formed by combining two or more words).
RBAR – (i) Row by agonizing row – a derogatory way of describing a technique of scanning a set of records in a database to update or examine the contents of each one. This is the technique of last resort in most cases, since most database operations are optimized when using set based analysis instead of the RBAR method.
RTLS – (a) Return to launch site – period in NASA Space Shuttle assent profile where, during assent, shuttle aborts assent and turns and glides back to landing strip at launch site
RTPO-RM – (i) Real Time Production Optimization – Reservoir Management