The phrase "double arrow" is not a standard part of written English, and so should not be used in general writing.
It may be used in specific contexts where it could be considered appropriate by those familiar with the terminology, such as in programming or certain engineering fields. For example, "The system works by following the instructions indicated by the double arrow."
The newly introduced strut injector models are named as rocket and double arrow shape strut injectors.
e, Double immunolabelling with Dmrt3 (arrowhead) and Wt1 (double arrow) show a partial overlap (arrow).
A single arrow between them denotes an irreversible reaction, a double arrow a reversible reaction.
Using system dynamics (SD) method, the event quantification is performed for the event flows, stocks, and feedback where the single and double arrow lines are incorporated.
It is also found that both the rocket and double arrow strut models increases the boundary layer separation and vortex formation and therefore it enhances the better mixing of fuel and air and finally it improves the combustion efficiency.
Appearance of two discrete PSD-95 clusters is observed in raw STED images in both Atto-647N and AlexaFluor-594 channels in one spine (double arrow), while the neighboring spine has only one cluster (single arrow).
When I started to look at the scene more closely, I noticed that at the base of the rock was a graffitied double arrow, almost certainly a reference point for some refugee boat, which is one of the reasons why the place was so heavily patrolled by the army.
The red double arrow indicates the dark vein.
That's not to say that I found the rest of this interesting-looking, double-arrow grid by David Steinberg too difficult.
The redesign gets rid of the star and swooshing double-arrow inherited from EADS's main founders, DASA of Germany and Aerospatiale-Matra of France.
The colour gradient is proportional to the measured intensity and shows that along this pump sweep a single lasing line first turns off and then re-emerges with a shifted frequency (see frequency splitting indicated by the double-arrow).
