Look at this excerpt from a manual for sunfun inc.

which text element indicates that the text is in a sequence?
1.subheadings
2.bold words
3.numbering
4.bullets

Judging from other sources where the manual is shown:

numbering is the answer

Manuals usually show that they are in a sequence by numbering.

Explanation:

Numbering allows the information contained in a manual to be organized separately, showing "step-by-step" how a certain thing should be done. This allows to create a logical sequence showing the reader the steps that must be followed in a certain order, leading the reader to carry out an activity or reach the conclusion or the establishment of a final product in a practical, dynamic and efficient way.

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