Although this category is referred to as ‘internal’, any methods documented within the API site should be considered public and may be freely used.

Also in: Deprecated > Deprecated 1.10 | Properties > Properties of jQuery Object Instances | Removed
.context
The DOM node context originally passed to jQuery(); if none was passed then context will likely be the document.

Also in: Properties > Properties of jQuery Object Instances
.jquery
A string containing the jQuery version number.

jQuery.error()
Takes a string and throws an exception containing it.

.pushStack()
Add a collection of DOM elements onto the jQuery stack.

Also in: Deprecated > Deprecated 1.7 | Properties > Properties of jQuery Object Instances | Removed
.selector
A selector representing selector passed to jQuery(), if any, when creating the original set.