FieldHint is an option for InputField that specifies contents to display when the input field is empty.
ImageAssemble[{{image_11, image_12, ...}, {image_21, ...}, ...}] assembles a single image from an array of images.
TooltipDelay is an option for objects such as Tooltip that specifies how long to delay after the mouse is over the object before displaying the tooltip.
IncludePods is an option for WolframAlpha that determines specific pod IDs to include in the results.
$Line
(Built-in Mathematica Symbol) $Line is a global variable that specifies the number of the current input line.
ImageChannels[image] gives the number of channels present in the data for the Image object image.
Latitude[pos] gives the latitude in degrees of a geographic position specified by pos.Latitude[pos, datum] gives the latitude referring to the specified geodetic datum.
Legended[expr, lbl] indicates that a legend entry for expr should be created, with label lbl.
LongestCommonSequence[s_1, s_2] finds the longest sequence of contiguous or disjoint elements common to the strings or lists s_1 and s_2.
Longitude[pos] gives the longitude in degrees of a geographic position specified by pos.Longitude[pos, datum] gives the longitude referring to the specified geodetic datum.