(US, Canada, telephony) The telephone number used for last-call return services

(Canada, US, telephony) To use the last-call return service / (slang) To trace back, backtrace

(US, Canada) To press the keys *69 in succession on the keypad of a telephone, usually after a missed call, which results in a last-call return by automatically dialling the telephone number of the last caller.

(molecular biology) The large subunit of the eukaryotic 80S ribosomes.

(computing) An EPIC 64-bit instruction set architecture designed to allow relatively simple, cheap CPUs to execute many 64-bit instructions simultaneously and with potentially very high performance; developed by Intel in the late 1990s with the intent of replacing the older x86 architecture, but was delayed and proved uncompetitive with x86 (especially x86-64), seeing use only in Intel's own Itanium line of high-end CPUs.

plural of 6B

(medicine) A severity score validated for predicting mortality in community-acquired pneumonia, often used to determine the need for hospital admission. It comprises five risk factors: confusion of new onset; blood urea nitrogen > 7 mmol/L; respiratory rate ≥ 30/minute; systolic blood pressure < 90 mmHg and/or diastolic blood pressure ≤ 60 mmHg; age ≥ 65 years.

Alternative form of sixty-nine

Alternative form of sixty-nine

Initialism of 6 Degrees Of Freedom; the range of movements allowed in a virtual-reality system and related games, namely those in the x-, y- and z-directions, or pitch, yaw and roll respectively