かいだん階段kaidan
1.

A structured pathway consisting of multiple steps that connects different levels or heights, allowing people to ascend or descend from one floor to another.

2.

A metaphorical concept referring to the progression or advancement in social status or rank, often illustrated as climbing up a series of levels in a hierarchy.

Example:

その階段を上ってはいけません。

らせんかいだん螺旋階段rasenkaidan
1.

A type of staircase that curves upward around a central axis, often seen in Western architecture, allowing for efficient use of vertical space while creating an elegant design.

2.

A stairway that forms a spiral shape, leading to different levels in a building, commonly found in towers and larger structures, enhancing both aesthetics and functionality.

3.

A continuous set of steps arranged in a helical form, facilitating movement between floors in a compact manner, often integrating artistic elements and serving as a focal point in interior design.

4.

An architectural feature characterized by its twisting ascent around a central pole or void, which not only connects multiple levels but also often serves as a decorative element within a space.

ひじょうかいだん非常階段hijoukaidan
1.

A staircase specifically designed for use during emergencies, such as fires or earthquakes, which is not intended for regular access or movement between floors.

2.

A secondary or alternate stairway that provides a safe exit route in critical situations, ensuring swift evacuation from a building.

3.

A stairway installed in buildings to facilitate escape during urgent scenarios, prioritizing safety and quick access for people evacuating from danger.

4.

An access point that is utilized in case of emergencies, offering a reliable means of reaching safety away from normal traffic routes within a structure.

Example:

このビルは非常階段を備えている。

うらかいだん裏階段urakaidan
1.

A secondary staircase located at the rear of a building, typically used for service access rather than for public entry.

2.

An informal or hidden pathway that offers a means of escape, often associated with a sense of secrecy or discretion.

3.

A route that avoids the main entrance, usually intended for staff or maintenance personnel to move about without being seen by the general public.

4.

A metaphorical term used to describe a less visible or unconventional way of achieving something, often implying a sense of subterfuge or bypassing standard procedures.