The reason for this is navigation boxes that are shared between articles via templates. When you have a navigation box linking to several articles within a topi

The reason for this is navigation boxes that are shared between articles via templates. When you have a navigation box linking to several articles within a topic, and you are on article 3, then it will render as [[Article 1]] - [[Article 2]] - **Article 3** - [[Article 4]] where [[words]] are links and *words* are just bold text. This allows the reader to identify their current position within the topic without requiring extra templating magic.