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Asymptote
A line that a graph approaches without touching.
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Axis of Symmetry
The line over which a graph can be reflected without altering the graph.
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Hole
A single point at which a function has no value.
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Horizontal Asymptote
If a graph has a horizontal asymptote of y = k, then part of the graph approaches the line y = k without touching it -- y is almost equal to k, but y is never exactly equal to k.
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Symmetry
If a graph does not change when reflected over a line or rotated around a point, the graph is symmetric with respect to that line or point.
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Vertical Asymptote
If a graph has a vertical asymptote of x = h, then part of the graph approaches the line x = h without touching it -- x is almost equal to h, but x is never exactly equal to h.