readout indicator
21Flashing rear-end device — The flashing rear end device, or FRED, (also called an end of train device, ETD or EOT) is an electronic device mounted on the end of North American freight trains in lieu of a caboose. Design and use More than just a flashing red taillight, the… …
22Ph — Chem. phenyl. * * * Quantitative measure of the strength of the acidity or alkalinity (see acid, base) of a solution. It is defined as the negative common logarithm of the concentration of hydrogen ions [H+] in moles/litre: pH = log10 [H+]. The… …
23pH — Chem. the symbol for the logarithm of the reciprocal of hydrogen ion concentration in gram atoms per liter, used to express the acidity or alkalinity of a solution on a scale of 0 to 14, where less than 7 represents acidity, 7 neutrality, and… …
24ph — Optics. phot; phots. * * * Quantitative measure of the strength of the acidity or alkalinity (see acid, base) of a solution. It is defined as the negative common logarithm of the concentration of hydrogen ions [H+] in moles/litre: pH = log10 [H+] …
25Sniper — For other uses, see Sniper (disambiguation). Sniper US Army sniper team shooting from within a room in Afghanistan with M24 SWS, 19 October 2006. Occupation Names Sniper Activity …
26Automated external defibrillator — An automated external defibrillator or AED is a portable electronic device that automatically diagnoses the potentially life threatening cardiac arrhythmias of ventricular fibrillation and ventricular tachycardia in a patient,cite… …
27Seven-segment display — A typical 7 segment LED display component, with decimal point. A seven segment display (SSD), or seven segment indicator, is a form of electronic display device for displaying decimal numerals that is an alternative to the more complex dot matrix …
28Knox class frigate — USS Robert E. Peary (FF 1073) and the skyline of San Francisco in the background Class overview Builders …
29Duel Disk — This article is about the fictional item in the Yu Gi Oh! anime. For the audio/video optical disc, see DualDisc. A Battle City Duel Disk in Standby Position. The Yu Gi Oh! Duel Disk, sometimes referred to as the Duel Disk Launcher, as marketed in …
30Geotagging — is the process of adding geographical identification metadata to various media such as photographs, video, websites, or RSS feeds and is a form of geospatial metadata. This data usually consists of latitude and longitude coordinates, though it… …
