Bad Names

name	why it's bad	alternative
`Fixnum`	obscure jargon	`Integer`
`attr_accessor`	"access" implies reading, not writing	`attribute`
default block	"default" is misleading	anonymous block
default hash	"default" is misleading	automatic hash
`case`	comprises many cases, not one case	`switch` or `compare`
`equal?`	compares identity (object_id), not equality	`identical?`
`yield`	implies thread/process swap	`call`

and in Rails...

name	why it's bad	alternative
`attr_accessible`	it's about setting, not accessing	`mass_assignable`
`html_safe`	its content will not be escaped in views	`html_dangerous` or `raw`

Slides