What unit does H stand for

(1)H, symbol of chemical element hydrogen H:(3 or δH):(2) symbol of enthalpy in thermodynamics: (3) unit of inductance in physics: "Henry" H: (4) symbol of magnetic field intensity in physics: (5) weather in meteorology indicates high pressure or anticyclone H: (6) hardness of pencil lead in pencil hardness table, such as HB.

In engineering, l, w and h refer to length, width and height:

(1) machinery industry-in millimeters;

(2) civil engineering-in centimeters as the basic unit:

(3) Road and bridge engineering-taking meters and kilometers as basic units:

(4) rural measurement-taking feet, feet and inches as the basic units:

(5) British countries-in inches as the basic unit.