Composition of Earth's atmosphere by volume. The lower pie represents the trace gases that together compose about 0.038% of the atmosphere (0.043% with CO 2 at 2014 concentration). The numbers are from a variety of years (mainly 1987, with CO 2 and methane from 2009) and do not represent any single source.
Dominance and submission (also called D/s) is a set of behaviors, customs, and rituals involving the submission of one person to another in an erotic episode or lifestyle. It is a subset of BDSM. Physical contact is not necessary, and D/s can be conducted anonymously over the telephone, email, or other messaging systems.
The D refers to the diameter of the object being lifted, while the d refers to the diameter of the wire rope sling, as shown in the figure at the upper right. For example, when a 1-inch wire rope sling is used to lift an object that measures 25 inches in diameter, the D/d Ratio is 25-to-1 (written 25/1). Alternatively, the D can refer to the cross-sectional diameter of the eye, hook, or other object being used to hoist the load, as shown in the figure at right.